Filter antenna device

Abstract

A filter antenna device is provided, which including a SIW filter structure, a SIW radiation structure cascaded with the SIW filter structure, a feeding port and a first coplanar waveguide that are provided on a side of the first resonant cavity facing away from the back cavity, a second coplanar waveguide provided on a side of the second resonant cavity close to the back cavity, a transmission wire provided in the back cavity and connected to one end of the second coplanar waveguide, and a probe connecting the transmission wire with the metal patch. The SIW filter structure includes a first resonant cavity and a second resonant cavity that are stacked from top to bottom and communicate with each other.

What is claimed is: 
     
       1. A filter antenna device, comprising:
 an Substrate Integrated Waveguide (SIW) filter structure; 
 an SIW radiation structure cascaded with the SIW filter structure, wherein the SIW filter structure comprises a first resonant cavity and a second resonant cavity that are stacked from top to bottom and communicate with each other, the SIW radiation structure comprises a back cavity arranged alongside and communicating with both the first resonant cavity and the second resonant cavity, and a metal patch received in the back cavity; 
 a feeding port and a first coplanar waveguide that are provided on a side of the first resonant cavity facing away from the back cavity; 
 a second coplanar waveguide provided on a side of the second resonant cavity close to the back cavity; 
 a transmission wire provided in the back cavity and connected to one end of the second coplanar waveguide; and 
 a probe connecting the transmission wire with the metal patch, 
 wherein the first coplanar waveguide has one end connected to the feeding port and another end opposite to an end of the second coplanar waveguide facing away from the transmission wire. 
 
     
     
       2. The filter antenna device as described in  claim 1 , wherein the SIW filter structure comprises a first dielectric substrate and a second dielectric substrate that are stacked from top to bottom, a first metal layer covering a surface of the first dielectric substrate facing away from the second dielectric substrate, a second metal layer covering a surface of the second dielectric substrate facing away from the first dielectric substrate, a third metal layer interposed between the first dielectric substrate and the second dielectric substrate, a plurality of first metallized through holes spaced apart from each other and penetrating the first dielectric substrate, and a plurality of second metallized through holes spaced apart from each other and penetrating the second dielectric substrate; wherein the plurality of first metallized through holes is arranged along a periphery of the first dielectric substrate and electrically connects the first metal layer with the third metal layer; the plurality of second metallized through holes is arranged along a periphery of the second dielectric substrate and electrically connects the second metal layer with the third metal layer; the first metal layer, the third metal layer and the plurality of first metallized through holes define the first resonant cavity, and the second metal layer, the third metal layer and the plurality of second metallized through holes define the second resonant cavity;
 wherein the SIW radiation structure comprises a third dielectric substrate provided alongside the first dielectric substrate and the second dielectric substrate, a fourth metal layer and a fifth metal layer respectively covering two opposite surfaces of the third dielectric substrate, and a plurality of third metallized through holes spaced apart from each other and penetrating the third dielectric substrate; wherein the plurality of third metallized through holes is arranged along a periphery of the third dielectric substrate and electrically connects the fourth metal layer with the fifth metal layer, and the fourth metal layer, the fifth metal layer and the plurality of third metallized through holes define the back cavity. 
 
     
     
       3. The filter antenna device as described in  claim 2 , wherein the fourth metal layer and the first metal layer are disposed in a same plane, and the fifth metal layer and the second metal layer are disposed in a same plane. 
     
     
       4. The filter antenna device as described in  claim 2 , wherein the first coplanar waveguide is provided in the first metal layer and extends from the feeding port towards the back cavity, and the second coplanar waveguide is provided in the second metal layer and extends in a same direction as the first coplanar waveguide. 
     
     
       5. The filter antenna device as described in  claim 4 , wherein a radiation window is provided in a center of the fourth metal layer, the metal patch is provided in the radiation window, the transmission wire is provided in the fifth metal layer, and the probe penetrates the third dielectric substrate and electrically connects the metal patch with the transmission wire. 
     
     
       6. The filter antenna device as described in  claim 5 , wherein the second coplanar waveguide comprises a center conductor strip and planar surfaces on two sides of the center conductor strip, and the transmission wire is connected to the center conductor strip. 
     
     
       7. The filter antenna device as described in  claim 6 , wherein the two coupling gaps are rectangular and are respectively provided on two sides of the first coplanar waveguide. 
     
     
       8. The filter antenna device as described in  claim 5 , wherein the third metal layer is provided with two coupling gaps spaced apart from each other, and the first resonant cavity and the second resonant cavity communicate with each other through the two coupling gaps. 
     
     
       9. The filter antenna device as described in  claim 2 , wherein one of the plurality of first metallized through holes and one of the plurality of second metallized through holes that communicate with each other are formed into one piece.